Linear algebra? *scratches head*
Strang’s textbook was used at quite a few colleges for a while in the 80’s and 90’s. There are different approaches to the development of the subject and I did not particularly care for some of the forms he developed. I had no use for them and preferred a more classical approach.
In my application, it was to solve for the roll, pitch and yaw angles of a camera.
I'm still trying to understand cubic zirconium.